/***************************************************************************
 * Copyright 2012 TXT e-solutions SpA
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This work was performed within the IoT_at_Work Project
 * and partially funded by the European Commission's
 * 7th Framework Programme under the research area ICT-2009.1.3
 * Internet of Things and enterprise environments.
 *
 * Authors:
 *      Carbone mattero (TXT e-solutions SpA)
 *
 * Contributors:
 *        Domenico Rotondi (TXT e-solutions SpA)
 **************************************************************************/
package it.txt.ens.authorisationService.gui.standalone.util;
import java.awt.EventQueue;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.channels.Channels;
import java.nio.channels.Pipe;
import java.util.Scanner;

import javax.swing.JTextArea;

/**
 * Redirect the text from standard out to jTextArea
 * 
 */
public class JTextAreaStream {
	
	private JTextArea area;

	public void redirectSystemOutputTo(JTextArea textArea) throws IOException {
		area = textArea;
		Pipe pipe = Pipe.open();
		OutputStream out = Channels.newOutputStream(pipe.sink());
		final InputStream in = Channels.newInputStream(pipe.source());
			Runnable task = new Runnable() {
			
			public void run() {
			loopRead(in);
			}
		};
		System.setOut(new PrintStream(out));
		Thread reader = new Thread(task, "Stream reader");
		reader.setDaemon(true);
		reader.start();
	}

	private void loopRead(InputStream stream) {
		Scanner in = new Scanner(new InputStreamReader(stream));
		while (in.hasNextLine()) {
			appendLine(in.nextLine());
		}
	}

	private void appendLine(final String text) {
		EventQueue.invokeLater(new Runnable() {
		
			public void run() {
				area.append(text);
				area.append("\n");
			}
		});
	}
	}